Thrashing machine



Apfi! 12. 1927.

A. E. H. WALLENBERG 'rmmsnme MACHINE Filed Sent; 15, 1923 Patented Apr.12, 1927.

UNITED STATES PATENT OFFICE.

AXEL EDVARD HENRIKSON WALLENBERG, OF VAS'IERLOSA, SWEDEN.

THRASHING MACHINE.

Application filed September 15, 1923, Serial No. 662,812, and in SwedenJune 21, 1922.

The present invention relates to an im provement in thrashing-machinesof the type which are provided in well-known manner with a chaff blowerfor removing the chad formed during the thrashing. The inventionconsists principally in that the chaff blower is combined with aseparate fan or blower for drawing off dust from one or more points inthe thrashing-machine where dust is formed during the thrashing. By thisarrangement the advantage is attained that the greater portion of thedust is removed and rendered harmless and that thus the air in thelocality where the thrashing machine is stationed becomes considerablyless dusty so that the work is very much facilitated for the labourersoccupied with the thrashing.

In the accompanying drawing an embodiment of the invention isillustrated by way of example. Fig. 1 shows a side elevation of athrashing-machine provided with an arrangement according to theinvention partly in section, and Fig. 2 shows a section of the combinedchaff blower and dust suction fan.

To one side of the thrashing-1nachine a casing 1 is secured in whichthere are provided two fan blowers 2 and 3, the former 2 of which is theusual chaff blower, and the other 3 is the dust suction fan. Both saidfan blowers are mounted beside one another on a common shaft 1 which isjournalled in one wall of the casing 1, and the end of which projectingoutside the casing carries a pulley 5, which is driven by means of abelt 6 from some other suitable shaft in the thrashing-machine. Thecasing 1 is provided with separate inlets and outlets for the two fanblowers which latter are separated from one another by a disk 7 mountedon the shaft 4, so that the fan blowers will work as if they werelocated in separate casings. The blades of the fan blowers are securedto the disk '7 and also to two outer rings 8 so that the blowers obtainthe required stability.

Referring to Fig. 2, 9 denotes the inlet to the chaff blower 2, and 10denotes its outlet. 11 is the inlet to the fan blower 3, and 12 is itsoutlet. To the outlet 10 from the fan blower there is connected a pipe18 which leads in the ordinary manner to a collecting place for thechaff, and to the outlet 12 from the dust suction fan blower 3 a pipe 11is connected which may for instance project up through the roof of thebarn and thus conducts the dust out into the open. In the embodimentillustrated the inlet 11 is formed in such manner that it partlysurrounds the pulley 5, for the purpose that said inlet shall project aslittle as possible from the casing 1. The said inlet communicatesthrough a duct 15 with a box or chamber 16 in which a partial vacuumwill thus be produced by the suction from the fan 3. The said box 16communicates through a pipe 17 having a portion 17 extendingtransversely to the machine and provided with openings 17 with a suctionbox 18 above the outlet 19 for the straw, said suction box 18 being opentowards said inlet 19 and provided wih ribs 20 which serve to preventthe straw from being drawn into said suction box 18 along with the dustwhich is drawn into said box 18 and further through the pipe 17 into thebox 16 and through the duct 15 to the fan 3. The box or chamber 16further communicates through a pipe 21 with the interior of thethrashing-machine, so that the dust within the machine is sucked out.The box or chamber 16 is further connected to a pipe 22 extendingcrosswise to the machine near the feed opening of the same and providedwith apertures 22, which pipe serves to draw off the dust which thethrashing drum tends to force out at this place. The box or chamber 16may also be in communication through pipes with the smutter and otherpoints of the machine where dust is formed during the thrashing.

I claim:

1. In a thrashing machine, the combination with a dust suction fanblower, of suction conduits leading from said blower to the feedopening, the straw outlet and the interior of the machine, and a chaffblower coaxially mounted with reference to said other blower and beingseparated therefrom and from said suction conduits.

2. In a thrashing-machine, the combination of a casing, a rotatableshaft in said casing, a disk within said casing secured to said shaftand rotatable therewith, a chaff blower secured to and supported onone'side of said disk within said casing, a dust suction fan blowersecured to and supported on the other side of said disk within saidcasing. and separate inlets and outlets in said casing to each of saidblowers.

AXEL EDVARD HENRIKSON WALLENBERG.

